How long do I have to file a claim on equal pay and sexual discrimination in Tennessee I could not when it happend because my husband worked there.

I was discriminated against at work for being a women and the man that took my job makes more than I did. I could not file suit at the time because my husband also worked there. He has found another job and I would like to file suit, can I. This happend in July 2011 but I did not know the man that took my place was making so much till a couple months ago. The owne''s wife/ office manager even told me a man should be doing my job. The company has already lost one law suit for firing a whistle blower. My state is Tennessee but I can not scroll down that far with my phone.